Diamond-fastener for tools.



No. 818,682. PATENTED APR. 24, 1906. O. D. P. GIBSON.

DIAMOND PASTBNER FOR TOOLS.

APPLICATION FILED JULY 22. 1905.

U N [TED STATES PATENT orrrcn.

CHARLES D. P. GIBSON, OF JERSEY CITY, N E\\' JERSEY, ASSIGNOR OFONE-THIRD TO CHARLES G. MALLIET AND ONE-"HIRD TO \YALTER l\'lALLlET, OFNEYV YORK, N. Y.

DlAMOND-FASTENER FOR TOOLS.

Specification of Letters Patent.

Patented April 24, 1906.

Iii (l-// 117mm, it may concern:

Be it known that 1, CHARLES D. P. GIBsoN, a citizen of the UnitedStates, residing at Jersey City, Hudson county, State of New Jersey,have invented new and useful Improvements in Diamond- Fasteners forTools, of which the following is a specification.

This invention relates to a diamond-fastener for tools of differentkinds, such as used for cutting, turning, milling, boring, &c.

The fastener is so constructed that the diamond may be readily securedand is tightly held to the tool by a screw-set, while 5 all softrnetalfastenings are avoided In the accompanying drawings, Figure 1 is a sideelevation of a cutting-tool embodying my invention; Fig. 2, an enlargedlongitudinal section, partly in elevation thereof; Fig. 3, a top view ofFig. 2; Fig. 4, a top View of Fig. 2 with the diamond and screw-capomitted; and Fig. 5, a cross-section on line 5 5, Fig. 2.

The letter a designates the stem or spindle of a tool having a reducedthreaded end a. This threaded end engages a screw cap or hood I), whichseats upon offset a of stem a and is somewhat longer than end a. At itstop cap I) is rounded, as at b, and perforated, as at If, suchperforation corresponding in size and configuration to a cross-sectionof a tapering diamond c, which is set into said perforation and projectswith its apex beyond the cap.

The threaded end a of stem a has a longitudinal bore or mortise a,adapted for the reception of the lower end or shank d of a nip D. Thebase of the shank (Z is rounded and is so supported upon the bottom ofbore a that the parts D and (L are rotatable in relation to one another.Above threaded end a the nip is expanded to form a centering andsupporting head (1, Which '[ills substantially cap I) i above threadedend (1 The head (1 has a concavity or recess (F, that forms a seat forthe base of diamond c.

In assembling the parts the nip D is inserted with its shank (7 into themortised stem (1, k the diamond is seated in recess (F, and then i thestem is screwed into the cap until the i diamond is securely confinedbetween nip and cap. 'hile the stem is thus being screwed into the cap,the rotation of the stem will not be imparted to the nip, which willmove only in an axial direction to prevent lateral strain upon thediamond.

It will be seen that by my invention the diamond may be readily fittedand is securely held to the tool and that all soft-metal fas tenings areavoided.

hat I claim is In a diamoinl fastener for tools, a threaded inortisedstem, a perforated cap engaged thereby, an inclosed nip having arecessed head and a shank around which the stem is rotatable, and atapering diamond between head and cap and projecting with its apexbeyond the cap, substantially as specified.

Signed by me at New York city, (Manhattan,) New York, this 20th day ofJuly, 1905.

CHARLES D. P. GIBSON.

\Vitnesses:

CHAS. G. MALLIET, WALTER MALLIET'.

